Chris@69: /*********************************************************************** Chris@69: Copyright (c) 2006-2011, Skype Limited. All rights reserved. Chris@69: Redistribution and use in source and binary forms, with or without Chris@69: modification, are permitted provided that the following conditions Chris@69: are met: Chris@69: - Redistributions of source code must retain the above copyright notice, Chris@69: this list of conditions and the following disclaimer. Chris@69: - Redistributions in binary form must reproduce the above copyright Chris@69: notice, this list of conditions and the following disclaimer in the Chris@69: documentation and/or other materials provided with the distribution. Chris@69: - Neither the name of Internet Society, IETF or IETF Trust, nor the Chris@69: names of specific contributors, may be used to endorse or promote Chris@69: products derived from this software without specific prior written Chris@69: permission. Chris@69: THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" Chris@69: AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE Chris@69: IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE Chris@69: ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE Chris@69: LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR Chris@69: CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF Chris@69: SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS Chris@69: INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN Chris@69: CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) Chris@69: ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE Chris@69: POSSIBILITY OF SUCH DAMAGE. Chris@69: ***********************************************************************/ Chris@69: Chris@69: #ifdef HAVE_CONFIG_H Chris@69: #include "config.h" Chris@69: #endif Chris@69: Chris@69: #include "main.h" Chris@69: Chris@69: /* shell coder; pulse-subframe length is hardcoded */ Chris@69: Chris@69: static OPUS_INLINE void combine_pulses( Chris@69: opus_int *out, /* O combined pulses vector [len] */ Chris@69: const opus_int *in, /* I input vector [2 * len] */ Chris@69: const opus_int len /* I number of OUTPUT samples */ Chris@69: ) Chris@69: { Chris@69: opus_int k; Chris@69: for( k = 0; k < len; k++ ) { Chris@69: out[ k ] = in[ 2 * k ] + in[ 2 * k + 1 ]; Chris@69: } Chris@69: } Chris@69: Chris@69: static OPUS_INLINE void encode_split( Chris@69: ec_enc *psRangeEnc, /* I/O compressor data structure */ Chris@69: const opus_int p_child1, /* I pulse amplitude of first child subframe */ Chris@69: const opus_int p, /* I pulse amplitude of current subframe */ Chris@69: const opus_uint8 *shell_table /* I table of shell cdfs */ Chris@69: ) Chris@69: { Chris@69: if( p > 0 ) { Chris@69: ec_enc_icdf( psRangeEnc, p_child1, &shell_table[ silk_shell_code_table_offsets[ p ] ], 8 ); Chris@69: } Chris@69: } Chris@69: Chris@69: static OPUS_INLINE void decode_split( Chris@69: opus_int16 *p_child1, /* O pulse amplitude of first child subframe */ Chris@69: opus_int16 *p_child2, /* O pulse amplitude of second child subframe */ Chris@69: ec_dec *psRangeDec, /* I/O Compressor data structure */ Chris@69: const opus_int p, /* I pulse amplitude of current subframe */ Chris@69: const opus_uint8 *shell_table /* I table of shell cdfs */ Chris@69: ) Chris@69: { Chris@69: if( p > 0 ) { Chris@69: p_child1[ 0 ] = ec_dec_icdf( psRangeDec, &shell_table[ silk_shell_code_table_offsets[ p ] ], 8 ); Chris@69: p_child2[ 0 ] = p - p_child1[ 0 ]; Chris@69: } else { Chris@69: p_child1[ 0 ] = 0; Chris@69: p_child2[ 0 ] = 0; Chris@69: } Chris@69: } Chris@69: Chris@69: /* Shell encoder, operates on one shell code frame of 16 pulses */ Chris@69: void silk_shell_encoder( Chris@69: ec_enc *psRangeEnc, /* I/O compressor data structure */ Chris@69: const opus_int *pulses0 /* I data: nonnegative pulse amplitudes */ Chris@69: ) Chris@69: { Chris@69: opus_int pulses1[ 8 ], pulses2[ 4 ], pulses3[ 2 ], pulses4[ 1 ]; Chris@69: Chris@69: /* this function operates on one shell code frame of 16 pulses */ Chris@69: silk_assert( SHELL_CODEC_FRAME_LENGTH == 16 ); Chris@69: Chris@69: /* tree representation per pulse-subframe */ Chris@69: combine_pulses( pulses1, pulses0, 8 ); Chris@69: combine_pulses( pulses2, pulses1, 4 ); Chris@69: combine_pulses( pulses3, pulses2, 2 ); Chris@69: combine_pulses( pulses4, pulses3, 1 ); Chris@69: Chris@69: encode_split( psRangeEnc, pulses3[ 0 ], pulses4[ 0 ], silk_shell_code_table3 ); Chris@69: Chris@69: encode_split( psRangeEnc, pulses2[ 0 ], pulses3[ 0 ], silk_shell_code_table2 ); Chris@69: Chris@69: encode_split( psRangeEnc, pulses1[ 0 ], pulses2[ 0 ], silk_shell_code_table1 ); Chris@69: encode_split( psRangeEnc, pulses0[ 0 ], pulses1[ 0 ], silk_shell_code_table0 ); Chris@69: encode_split( psRangeEnc, pulses0[ 2 ], pulses1[ 1 ], silk_shell_code_table0 ); Chris@69: Chris@69: encode_split( psRangeEnc, pulses1[ 2 ], pulses2[ 1 ], silk_shell_code_table1 ); Chris@69: encode_split( psRangeEnc, pulses0[ 4 ], pulses1[ 2 ], silk_shell_code_table0 ); Chris@69: encode_split( psRangeEnc, pulses0[ 6 ], pulses1[ 3 ], silk_shell_code_table0 ); Chris@69: Chris@69: encode_split( psRangeEnc, pulses2[ 2 ], pulses3[ 1 ], silk_shell_code_table2 ); Chris@69: Chris@69: encode_split( psRangeEnc, pulses1[ 4 ], pulses2[ 2 ], silk_shell_code_table1 ); Chris@69: encode_split( psRangeEnc, pulses0[ 8 ], pulses1[ 4 ], silk_shell_code_table0 ); Chris@69: encode_split( psRangeEnc, pulses0[ 10 ], pulses1[ 5 ], silk_shell_code_table0 ); Chris@69: Chris@69: encode_split( psRangeEnc, pulses1[ 6 ], pulses2[ 3 ], silk_shell_code_table1 ); Chris@69: encode_split( psRangeEnc, pulses0[ 12 ], pulses1[ 6 ], silk_shell_code_table0 ); Chris@69: encode_split( psRangeEnc, pulses0[ 14 ], pulses1[ 7 ], silk_shell_code_table0 ); Chris@69: } Chris@69: Chris@69: Chris@69: /* Shell decoder, operates on one shell code frame of 16 pulses */ Chris@69: void silk_shell_decoder( Chris@69: opus_int16 *pulses0, /* O data: nonnegative pulse amplitudes */ Chris@69: ec_dec *psRangeDec, /* I/O Compressor data structure */ Chris@69: const opus_int pulses4 /* I number of pulses per pulse-subframe */ Chris@69: ) Chris@69: { Chris@69: opus_int16 pulses3[ 2 ], pulses2[ 4 ], pulses1[ 8 ]; Chris@69: Chris@69: /* this function operates on one shell code frame of 16 pulses */ Chris@69: silk_assert( SHELL_CODEC_FRAME_LENGTH == 16 ); Chris@69: Chris@69: decode_split( &pulses3[ 0 ], &pulses3[ 1 ], psRangeDec, pulses4, silk_shell_code_table3 ); Chris@69: Chris@69: decode_split( &pulses2[ 0 ], &pulses2[ 1 ], psRangeDec, pulses3[ 0 ], silk_shell_code_table2 ); Chris@69: Chris@69: decode_split( &pulses1[ 0 ], &pulses1[ 1 ], psRangeDec, pulses2[ 0 ], silk_shell_code_table1 ); Chris@69: decode_split( &pulses0[ 0 ], &pulses0[ 1 ], psRangeDec, pulses1[ 0 ], silk_shell_code_table0 ); Chris@69: decode_split( &pulses0[ 2 ], &pulses0[ 3 ], psRangeDec, pulses1[ 1 ], silk_shell_code_table0 ); Chris@69: Chris@69: decode_split( &pulses1[ 2 ], &pulses1[ 3 ], psRangeDec, pulses2[ 1 ], silk_shell_code_table1 ); Chris@69: decode_split( &pulses0[ 4 ], &pulses0[ 5 ], psRangeDec, pulses1[ 2 ], silk_shell_code_table0 ); Chris@69: decode_split( &pulses0[ 6 ], &pulses0[ 7 ], psRangeDec, pulses1[ 3 ], silk_shell_code_table0 ); Chris@69: Chris@69: decode_split( &pulses2[ 2 ], &pulses2[ 3 ], psRangeDec, pulses3[ 1 ], silk_shell_code_table2 ); Chris@69: Chris@69: decode_split( &pulses1[ 4 ], &pulses1[ 5 ], psRangeDec, pulses2[ 2 ], silk_shell_code_table1 ); Chris@69: decode_split( &pulses0[ 8 ], &pulses0[ 9 ], psRangeDec, pulses1[ 4 ], silk_shell_code_table0 ); Chris@69: decode_split( &pulses0[ 10 ], &pulses0[ 11 ], psRangeDec, pulses1[ 5 ], silk_shell_code_table0 ); Chris@69: Chris@69: decode_split( &pulses1[ 6 ], &pulses1[ 7 ], psRangeDec, pulses2[ 3 ], silk_shell_code_table1 ); Chris@69: decode_split( &pulses0[ 12 ], &pulses0[ 13 ], psRangeDec, pulses1[ 6 ], silk_shell_code_table0 ); Chris@69: decode_split( &pulses0[ 14 ], &pulses0[ 15 ], psRangeDec, pulses1[ 7 ], silk_shell_code_table0 ); Chris@69: }